Mounting



May 25, 1926. 1,585,718 r E. H. JACOBS MOUNTING Filed April 22, 1921 2 Sheets-Sheet 1 May 25 1926.

E. H. JACOBS MOUNTING Filed April 22, 1921 2 Sheets-Sheet 2 Patented May 25, 1926.

UNITED STATES ERNEST H. JACOBS, OF CHICAGO, ILLINOIS, ASSIGNOR T0 ELECTRICAL ENGINEERS PATENT oFricE.

EQUIPMENT COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

MOUNTING.

Application filed April 22, 1921. Serial No. 463,676.

My invention relates to equipment for the distribution of power by electricity, especially at high voltages, and more specifically, to an improved insulating mounting for electrical apparatus.

One object of my invention is to provide for an increase in the insulating strength of a mounting of a given size. It is well known that an electric insulator can readily be designed to give a creepage resistance. along the surface of the insulator substantially equal to, or, if desired, greater than, the shortest air path between the clamping elements engaging opposite ends of the insulator. These clamping elements, however, and especially the fittings for connecting the, clamping elements tothe supports for the insulator and the apparatus mounted on the insulator, usually occupy a considerable space measured along the axis of the insulator, so that when the axis of the insulator is perpendicular to the support and to the apparatus supported, the .air gap between the apparatus and the support is much larger than it need be to secure sufficient insulating strength, and the overall dimensions of the entire installation are materially greater than they need be.

The first mentioned object comprises, therefore, more specifically, the provision of means for mounting the insulators with their axes inclined to a line perpendicular to the support and to the supported apparatus, whereby the support and the apparatus may be set'closer together, and the over-all dimensions of the equipment reduced.

Another object is to provide simple and improved fittings for both ends of the insulator when it is in position with its axis inclined.

On account of the inclination of the axis of the insulator, any rotation of the insulator about its own axis will tend to swing the plane of the supporting surface receiving the apparatus out of correct alignment. Another object of my invention, therefore, is to provide-means associated with the insulator clamp for positively preventing rotation of the insulator about its own axis.

Further objects and advantages of my invention will become apparent as the description proceeds.

In the accompanying drawing:

Fig. l is a side view showing apparatus mounted on supporting means constructed according to the principles of my invention. Figure'2 is a central section through the pedestal and a portion of the insulator; and,

Figure 3 is a detail section in a plane at right angles to the plane of Figure 2.

The insulators 62 illustrated in Figure 1 although not limited to are particularly adapted for relatively high voltages and are shown supporting a disconnecting switch 64. In this figure I have indicated the various paths along which currents might flow from the electrical apparatus to the supports, across air gap a, Z), c, d and 6, representing distances commonly referred to in this art as striking distances. The insulator should preferably be so designed, and set at such an angle, that the resistance of air gaps a and b will be approximately equal, and approximately equal to the creepage resistance tending to prevent a discharge of current along the surface of the insulator. The spacing of successive insulators along the supports should preferably be such that the resistance of air gaps 0 and cl will be approximately equal to that of air gaps a and 6. While the necessary dimensions of the apparatus supported may in some instances result in slight variations of air gaps c and d, from equality with the other air gaps, in most instances it is possible to make these distances not less than the other striking distances.

The clamping means for the lower end of the insulator shown in Figure 1, comprises semi-circular portions bolted together at 66, and having feet 68 bolted to the flange 22 of the pedestal 14. This form of clamp may be considered illustrative of many different forms, all of which merely hold the insulator against displacement on its supporting pedestal, offering only frictional resistance to rotation of the insulator about its axis. As rotation of the insulator 62, by reason of their inclination to the support, would swing the pedestal for the apparatus out of correct alignment, I prefer to provide positive means for orienting the insulator, and

for preventing rotation thereof around its own axis. For this purpose, the feet 68 of the clamp are spaced from flange 22 by a plate 7 O, which plate is preferably bolted to the flange 22, not only by the bolts engaging feet 68 but by other bolts 72 entering the plate only, (see Figs. 2 and 3), Which last mentioned bolts may be placed in position first to correctly orient the plate 70. The insulator pin 74 is fastened in the body of the insulator in any suitable manner, as by the 'usual cement engaging a'corrugated upper end 76, and carries laterally projecting keys 78, illustrated as of semi-circular crosssection. These keys are preferably two in number, extending in opposite directions, and overlying the plate 70, being suitably attached thereto by rivets S0. The pin 7% may, if desired, have a central threaded projection 82 engaging a threaded hole in the plate 70. The skirt 8% of the insulator has suitable recesses 86 formed therein to receive the keys '78, and is thereby correctly oriented and positively restrained from rotation about its OWIl longitudinal axis.

Without further elaboration, the fore going will so fully explain the gist of my invention, that others may, by applying current knowledge, readily adapt the same for use under various conditions of service Without eliminating certain features which may be said to constitute the essential items of novelty in my invention, which items are intended to be defined and secured to me by the following claims:

I claim:

1. In a mounting for electrical apparatus, a pedestal comprising a hollow truncated cone having terminal flanges lying in planes at an angle to each other,a support, means attaching one of said flanges to said support, an insulator mounted on the other flange and lying at an angle to said support, and exposed means externally attaching said insulator to said last flange.

2. In a mounting for electrical apparatus, in combination, an insulator, a support, a pedestal having a support engaging base, and a second base lying obliquely with respect said support engaging base upon which said insulator is adapted to be co-operating mounted at an angle to said support, and exposed means externally attaching said insulator to said last base.

3. In a mounting for electrical apparatus, in combination, a support, a pedestal on said support, an insulator on said pedestal having its axis at an angletothe'horizontal When said support is vertical, and means for fastening said insulator on said support, includingclampingvmeans for preventing dis placement, and additional means for preventing rotation.

i. In a mounting for electrical apparatus, in combination, a pedestal having a base, a plate bolted on said base, an insulator on said plate, clamping means encircling said insulator and bolted to said plate and base to prevent displacement of said insulator, and key means projecting from said plate for engagement with said insulator to prevent rotation thereof.

5. In a mounting for electrical apparatus, a base, an insulator, clamping means having peripheral engagement with said insulator and fixedly fastened on said base to positively prevent displacement and frictionally resist rotation of said insulator, a central pin in said insulator, and lateral projections at the bottom of said central pin posi tively keying said insulator against rotation and co-operating with said clamping means to resist displacement of said insulator.

6. in amounting for electrical insulators, a pedestal having tWo bases lying in nonparallel planes, an insulator positioned over one of these with its axis normal to the plane thereof, a pin inside 'said insulator terminating above said last mentioned base, and lateral keys projecting from the bottom of said pin having keyed relation with the body of said insulator and fastened to said base to prevent rotation of said insulator.

In Witness whereof, I hereunto subscribe my name, this 18th day of April A. 1).,

ERNEST H. JACOBS. 

